Hand drill



A. H. SWEETLAND, DECD.

`l. swEETLANLL EXEcuT HAND DRILL.

RIX.,

APPLICATION FILED OCT. 20,19I9.

Patented Apr. 4, 1922.

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Lis in line with the drill at all times.

1 ispne of the important features of myn- UNITED s'mrEsl PATENT OFFICE.

ARTHUR H. SWEETLAND, OF LONG BEACH, CALIFORNIA; INEZ SWEETLANI) EXECU-TRIX OF SAID ARTHUR H. SWEETLAND, DECEASED.

I HAND DRILL.

Specification of Letters Patent.

Patented Apr. '4, 1922.

Application led October 20, 1919. Serial No. 331,864. v

To aZZ whom it may concern:

Be it known that I, ARTHUR I-I. SWEET- LAND, a citizen of theUnitedStates, residing at Long Beach, in the county of Los Angeles,State of California, have invented new and useful Improvements in Handpistol form. with a pistol grip, lubricatingl means, cooling means,switch means which may be easily' turned on and off; making a devicewhich may be usedL with great eiliciency. f

The device consists mainly pf a pistol. shaped case which holds anarmature Shaft which in turn is geared to a chuck in which drills may beset. 'On this armature shaft I mount a cooling fan which sucks air fromopenings in a protected position in the lower part of the case, aroundthe motor armature, the fan being mounted in such a manner on `theinside of the case that it is impossible to catch the lingers therein.

The device is made so thatithe user can get a good firm hold on thepistol grip, thev button for the switch being directly above the gripand adapted for operation by the thumb. rlhe chuck is mounted in directline with the hand grip, so that the applied frprce his vention. 'llhemotor shaft extends out at one end so that a grinding wheel may bemounted thereon, and for other purposesl as hereinafter described.

I will describe a preferred form of my* 4invention indetail, 'referringto the aecomo:

panying drawings, in which- Fig. 1 is a side elevation of my devlce;

Fig. 2 is a vertical central longitudinal sec'I tion thereof; Fig. 3 isa horizontal section taken on line 3-3 of Fig. 2; and Fig. 4 is an endelevation of the device.

In these drawings the numeral 10 desig nates the case in which my deviceis mount-z ed, and 11 the hollow pistol grip. Arma-1 ture 13 is mountedonshaft 14 which re shown in Fig. 2. On shaft 14 I place pinion 17 whichmeshes with large gear 18 mounted on chuck shaft 19 supported in bearin20 at the lower forward endof the case. T ese gears are sized in suchproportion that the chuck shaft will turn from 500 to 900 R. I. M.depending on the pressureon the pistol grip and the size of the drill.The drill chuck 22 is mounted on shaft 19in an ordinary manner. ,Y o

On the rear end of armature shaft 14 I place fan .24 which has for itsfunction the cooling of the whole device. Air holes 25 are placed on theforward lower side of 4the case behind. the gear case 10a. the shaft 14revolves the fan 24 which sucks air through the air holes 25, around thearmature and forces it out through hollow handle 11 and through openings.26 at the back of the case. placed in such a position on the case thatit is impossible for dirt to fall into 'the case. By this means I keepmy device cool and. also keep theinside ofv the case clean.

These air holes 25 are 75 The fan rotates in such a direction that itwill push the lingers out if they happen to be linserted throughopenings 26.

Oil holes 27 and 28 are providedffor the oiling of the two shafts 14 and19. i

`End thrust of the chuck shaft 'is taken 35 by a simple end thrustbearing. This may be in the form of a hard steel ball set in a socket 42in. the wall of gear case 10, the end of the shaft bearing against vtheball, one side of which may be flattened sli htly for that purpose. K

`lectrical connection is made through cable 30 toV contact 31; and the'circuit is .closed by pressing on push button 32 which shoves push rod30 forward until contact 95 Armature shaft it-*projects forwardatloll14b for the purpose of mounting a small .grinding wheel, if desired; andfor the purpose of carrying a collar or disk 40; by

Turning of 70A The motor is preferably ay series 10o means of which theshaft 14b and chuck f il volves in bushings 15 "and 16, as is best shaft19 may be held from` turning when 110 the chuck is being set orloosened-the chuck being operated by rotation. The fact that gearl? issmaller than gear 18 facilitates this operation, shaft 14 being easilyheld from rotation. rlhe gear ratio inthe spel ciecase here described is6 to 1.

The drill here described and illustrated (the dravviny are full size)successfully operates drillsS up to one-quarter inch and does fastwork.' It is easlly handled; the grip is natural-fthe palm ofthe handcomes 1n a directfax-ial line back of the drill axis, and the fingersclutch the motor case while the thumb presses, against the push buttonand against the case. The grip is naturally firm. Due to all'thesefeatures the drill is easily and accurately held in proper alignment,and ,breakage of drills due to .unsteady holding is very small. If it isdesired to put more pressure on the drill the same may be used as abreast drill.

From the' foregoing it willbe seen that l have provided a hand drillsimple and compact in character, and one that may be used with greatefficiency in limited spaces. The hand is in a direct line with thechuck and ,drill and the push button in a convenient place. The oilingand cooling systems are efficient and simple; and the drill is of lightweight. The casing may be of aluminum.

It will 'be understood that my device may be modified in` detail ofstructure and arrangement without departing from the features hereintypified; and also that it may be used for spec-inc purposes not hereinmentioned. Such variations l do not exclude, except as specificallystated in the following claims.

Having described a preferred form of my invention, l claim L" 1. Thecombination of a motor casing, a handle at the rear end and extending toone side of the casing, whereby the casing may be supported by one handwith the fingers thereof engaging both the handle and body of thecasing, and 'the palm bearing against the back ofthe handle, a motorwithin the casing, a chuck shaft journaled in the casing on an axisbetween the motor axis and the side of the casing beyond which thehandle projects, so that longitudinal pressure exerted on lthe handle bythe palm of the hand supporting' the tool' will be in substantialalignment with the chuck shaft and the center of mass of the'casing andmotor is at one side of the axis of the chuck shaft, and drivingconnections between the motor and chuck shaft.

2. The combmajtionuof a motor oasinghaving' approximately' the form of apistol adapted to be held in one hand w" 'L1 the fingers grasping thebody and the palm bearing against the handle thereof, a motor within thecasing above and forward of the handle, a chuck shaft journaled in theforward end of the casing on an axis below the motor and in alignmentwith the portion of the case against which the operators palm bears,gearing connecting the chuck shaft and motor at the forward end of thecasing, and a supplemental casefor said gearing extending below the maincase.

3. The dombination of a motor casing having at its rear end a handlethat extends laterally beyond one side of the casing whereby thelatter-may be supported by one hand with the fingers thereof engagingboth the handle and body of the casing and with the palm bearing againstthe back of the handle, a motor within the casing, a chuck shaftjournaled in a bearing supported by the front end of the casing, saidshaft extending forward from the casing and in substantial alignmentwith the portion of the handle against which pressureof the palm of theoperators hand supporting the tool is exerted, and ,gearing connectingthe motor and chuck shaft.

.4. ln a hand drill or the like, a case carrying a motor, the shaftthereof extendingbeyoud one end of the casing, a chuck shaft journalledin the case and geared to the motor to run at a speed lower than motorspeed, a chuck on the shaft adapted to be set and loosened by revolutionrelative to the shaft, and a thumb wheel on the projecting end of themotor shaft which may be grasped to hold the motor shaft and chuck shaftstationary while rotating the chuck.

5. rlhe combination of a motor casing having approximately the form of apistol adapted'to be held and supported in one hand with the lingersgrasping the body of the casing and handle and the palm hearing againstthe handle thereof, a motor within the casing, a chuck shaft journaledin the casing and extending forwardly therefrom, gearing connecting thechuck shaft and motor, and a switch controlling movement of the motormounted on the rear of the body of the casing above the handle portionthereof in positiontoy be operated by the thumb of the hand supportingthe casing.

ln witness that l claim the foregoing have hereunto subscribed my namethis 13th i day of October, 1919. y

ARTHlIR l. SWEELAND.

Witness z l( incinta ll. ldnmncnn.

